Mark Dickinson added the comment:

Unlike C, Python doesn't have any 'character' type:  the elements of a string 
are simply 1-character strings.  The two quote styles are mostly 
interchangeable:  again, unlike C, there's no particular meaning attached to 
the use of single quotes or double quotes.

So you'd be asking for 1-character strings to be represented using single 
quotes and multi-character strings to be representing using double quotes.  
That doesn't seem like a particularly useful distinction.  Worse, it might even 
be misleading, since it would suggest a C-like distinction between characters 
and strings.

As to which file:  you're looking for the implementation of str.__repr__, which 
is in the unicode_repr function in Objects/unicodeobject.c.  The logic for 
choosing which style of quote to use is about 50 lines into that function (line 
12128 at revision eeda59e08c83).

Closing this as rejected.

----------
nosy: +mark.dickinson
resolution:  -> rejected
status: open -> closed

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<http://bugs.python.org/issue18708>
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